Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-independent Interactions

• URL: http://arxiv.org/abs/2308.16069v1
• Date: Wed, 30 Aug 2023 14:46:50 GMT
• Title: Spin Rotations in a Bose-Einstein Condensate Driven by Counterflow and Spin-independent Interactions
• Authors: David C. Spierings, Joseph H. Thywissen, and Aephraim M. Steinberg
• Abstract summary: We observe spin rotations caused by atomic collisions in a non-equilibrium Bose-condensed gas of $87$Rb. A local magnetodynamic model captures the salient features of the observed spin textures.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We observe spin rotations caused by atomic collisions in a non-equilibrium Bose-condensed gas of $^{87}$Rb. Reflection from a pseudomagnetic barrier creates counterflow in which forward- and backward-propagating matter waves have partly transverse spin directions. Even though inter-atomic interaction strengths are state-independent, the indistinguishability of parallel spins leads to spin dynamics. A local magnetodynamic model, which captures the salient features of the observed spin textures, highlights an essential connection between four-wave mixing and collisional spin rotation. The observed phenomenon has previously been thought to exist only in nondegenerate gases; our observations and model clarify the nature of these effective-magnetic spin rotations.

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